It is difficult to retain what you may have learned unless you should practice it. -Difficile est tenere quae acceperis nisi exerceas
Pliny the YoungerHe [Pliny the Elder] used to say that 'no book [etc] was so bad but some good might be got out of it'.
Pliny the YoungerThe erection of a monument is superfluous, our memory will endure if our lives have deserved it.
Pliny the YoungerUnfinished paintings are more admired than the finished because the artist's actual thoughts are left visible.
Pliny the Younger